Flash exposure confirmation, Using the zoom button and wide panel – Canon 550EX User Manual
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7. Flash Exposure Confirmation
When a correct flash exposure has been
obtained,
the
flash
exposure
confirmation lamp on the back of the
Speedlite lights in yellow-green for 3 sec.
If the flash exposure confirmation lamp
does not light after the flash fires, the
picture may have been underexposed.
Move closer to the subject and try again.
8. Using the Zoom Button and Wide Panel
ETTL
Zoom
5umm
05 07
V______
152 3 4 6 9 13 18tn
— SEL/SET ZOOM
The Speedlite’s flash head zooms
automatically to provide adequate flash
coverage for the current lens focal
length. The Speedlite can provide
adequate flash coverage for 24mm to
105mm lens focal lengths. If a zoom lens
is zoomed, the flash head also zooms to
suit the lens focal length. The flash
head's zoom setting can also be set
manually.
The Speedlite’s built-in wide panel
provides flash coverage for 17mm wide-
angle lenses.
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